Roller mill



March 1 1927.

E. LAW

ROLLER MILL Filed Oct. 12, 1926 2 Sheets-Sheet 1 ,m. HMWN ZJu/a rellzaur figq March 1 1927. E. LAW

ROLLER MILL Filed 001;. 12, 1926 2. Sheets-Sheet 2 Eolu/a rsllza w Patented Mar. 1, 1927.

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ROLLER MILL.

Application, filed October 12,1926. serial iflofl' llglfll.

This invention relates to improvements in uartz 'mills and particularly to improvements in fthe quartz -=1nill illustrated in the patent; to Edwin Gr. Trow-bridge, granted on uly 15,1924, No. 1,501,503.

The general objectv of the inventionis o provide a quartz .Ini'll comprising two opposefldheads and oircumferentially extending liner bars operatively mounted-upon the heads so as toiorm ajdru-mlor barrel,"these {liner barsbeing separated a-from each other by shimsso as ;to permitwthe quartz powjderedl by the b ails disposed within the tumbling mill'tobe discharged.

A further object is to provide improved means ier supporting these circumferential'ly epgten'c'ling v liner bars and holding these arci atebars er-liners in place, yet PEI'lIlltting these liners orloars "to be adj .usted into spacedrelationxtoeach other "'by'the use of s m Qther objects will appear in the course of th 'fqllowin ude elip 'Myinyention is illustratedin the accompanying drawings wherein Figure :1 is a frontelevation ofa quartz; mill constructed in accordance with my in v n ion; f 2 is a vertical transverse sectional View therethrough;

' ,Fig. 3 is a section on the line j33 or Figure 2; i

Fig. A is .an endelevationof the machine;

Fig. '5 is a section on the line 5-75 of Figure l.

:fRe'ferring tothese drawings itwill be seen that this roller mill or tu-mbling mill is {formed of two spaced heads designated 10 and 11, the'head lO'beingprovided with an -,end .plate 12, carrying a tubular shaft or trunhipn .13 mounted in suitablebearings let, this tubular shaft aetingas means whereby quartz or other material maybefed intothe interior of the rotatingbarrel. The opposite head is provided with means for supporting any suitable gear wheel or other means whereby the barrel 'inay be rotated by power. The margin ofeach headis providedwith a plurality of evenly spaced outwardly protuberantlugs 16, perforated for the passage of bolts and inward of the periphery ofthe head, each head is formed with a series oat outwardlyaprotuberant portions .17 audi incesses 1:8 are of the I lugs 1'6=iai1cl a recess is: -pregferably disposed 1 midway between :the s liu-gs i 16.

Extending transversely: across, between: the heads: are ea plurality o'f'bracket bars; designated generally 1 9,Y:each of-Fthese bnanxetw bars being iior uthe greater iportion :of Hits length, rectangular in; cross seet-ionxandfip-roividetd withzthe flanges 20, these flanges extending 'lateralliy from the 1 bracket Yba'I'S-EOI' =circnnfierentiallywith 'referenoeito the drum; ilDachl bracket: barat its extremities isrtormed with athe stud bolts 21Wlfivl6ll.='fl'18 screwthreaded "for the ureoeption 0f nuts 22. These stud: bolts are ,adapted 'JJEO be a -inserted through apentures in "the lugs :lfiaaznd the "heads heldiaga-inst the shoulders :23ibyvthe nuts :22. I [have :shoinnweigh-t of :these bracket bars extending ntransvcrse-ly laoross theidruni orbarrel'but :I do not aivish tobe :limitedi to this number as fewer: bnaoketr'bars might bemused if desired.

Disposed "between and resting 'np'on :these bracket barsiare the fareuatexorneurvetl, eircumferentially:extending liner bars'Q-arhich are preferably formed pf manganese "steel. Eachof these liner bars ataitsvextremities is cutaway to provide a :tongue' or lug 25 whichrests upenrt-he: aupper fia'ce of'the aadj acent fflange 20 and :snpports 1the 'li=ner rbars with their inner faces approximately {flush with the inner :faces of the braelret bars.

The liner bars are under rordinary circumstances, about 1% WlClG and, -the-re.for e, a

plurality of these liner "bars will 1 be disposed side by side -betweeneach pair of bracket or supporting "bars 19, and .the :SPELCB between these liner bars permits the discharge of finely powdered quartz or 'oth er material.

For the purpose ofho'lding the liner "bars in place against the flanges of the braeket bars, provide a plurality er transversely 6XtBI1Cl'lI 1g radially disposed backing bars 26 whicha're rounded upon their inner faces and bear-against the liner bars and are held inplaee by bolts 27 passing radially through the backi-n-gibars, through the fl'anges o'fthe heads, and into recesses 18. "The headof the bol t 27 is disposed within the corresponding recess "18 and the cuter end of the bolt is engaged by a nut 28 which forces the backing bar inward against the liner bars, thus holding these liner bars rigidly in place. These backing bars are preferably made of mild steel.

Disposed within the barrel formed by the liner bars are one or more rolls 29 having a length nearly equal to the length of the barrel and slightly rounded at the ends, but which may be of any suitable construction.

The operation of a tumbling mill of this character needs no description but in the operation of this mechanism the quartz rock is fed into the interior of the barrel through the feed opening formed in the tubular bearing or journal and the crushed quartz is discharged through the spaces between the liner bars. Preferably the quartz is carried into the interior of the barrel by a current of water and the grinding is thus done with water. The liner bars are spaced from each other varying distances, depending upon the circumstances of operation, by means of shims 30 inserted between the liner bars at the ends thereof and forcing these liner bars laterally apart. For this purpose I may use either ordinary shims or such as those disclosed in the said patent to Edwin G. Trowbridge, heretofore referred to. The shims are placed at the points of contact with the backing bars. hen these shims are introduced bet-ween the liners, the nuts on the extremities of the bracket bars are loosened to permit the lateral movement of the liner bars due to the introduction of the shims, and then these nuts are tightened up again and thus the liners are drawn tightly together against the shims. Thus, any desired mesh may be secured by introducing the proper shims between the liners.

It will be seen that in a tumbling mill or roller mill constructed in accordance with my invention there is much less impediment to the proper movement of the rollers than where the liner bars run transversely or parallel to the axis of the barrel as in the Trowbridge patent, heretofore referred to. In the Trowbridge construction a plurality of facets are formed by the liner bars and thus the smooth rolling movement of the rollers is impeded and a uniform grinding or crushing of the rock is prevented. With my improved mill the liners are never shifted radially outward or radially inward by the introduction of shims as they must be in the construction of Trowbridge, but the liners have a unlformly curved inner surface flush with the bracket bars so that the rollers have a uniformly curved surface over which to roll and thus secure a maximum crushing 7 action which will produce powder of uniform fineness.

I claim: 7 H 1. A roller mill includingopposed heads, transversely extending bracket bars mounted between said heads and having flanges, and arcuate liner bars extending Cll'ClllIlfBlF entially of the barrel and having their ends resting upon and supported by said flanges,

and having their inner faces flush with the inner faces of the bracket bars, there being a plurality of liner bars disposed side by side between the heads, the liner bars being adapted to be spaced from each other by means of shims inserted between the liner bars.

2. A. roller mill of the character described including opposed heads, transversely eX- tending bracket bars disposed between said heads, the ends of the bracket bars having screw-threaded portions passing through the heads, nuts engaging said screw-threaded portions and holding the heads in spaced relation upon the bracket bars, each of said bracket bars being longitudinally flanged, a plurality of arcuate liner bars disposed be tween each pair of bracket bars and cut away to rest upon the flanges of the bracket bars and having their inner faces flush with. the inner faces of the bracket bars, and means for holding said liner bars in place against outward movement.

3. A roller mill of the character described including opposed heads, transversely extending bracket bars disposed between said heads, the ends of the bracket bars having screw-threaded portions passing through the heads, nuts engaging said screw-threaded portions and holding the heads in spaced relation upon the bracket bars, each of said bracket bars being longitudinally flanged, a plurality of arcuate liner bars disposed between each pair of bracket bars and cut away to rest upon the flanges of the bracket bars and having their inner faces flush with the inner faces of the bracket bars, and means forholding said liner bars in place against outward movement, comprising transversely extending backingbars operatively connected at their ends with said heads and bearing against the outer faces of the liner bars.

4. A roller mill of the character described including'opposed heads, transversely extending bracket bars disposed between said heads, the ends of the bracket bars having screw-threaded portions passing through the heads, nuts engaging said screw-threaded portions and holding the heads in spaced relation upon the bracket bars, each of said bracket bars being longitudinally flanged, a plurality of arcuate liner bars disposed between each pair of bracket bars and cut away to rest upon the flanges of the bracket bars and having their-inner faces flush with the inner faces of the bracket bars, and means for holding said liner bars in place against outward movement, comprising transversely extending backing bars resting at their ends upon the peripheries of the heads and bearing against the outer faces of the liner bars, and bolts passing through the ends of each bracket bar and radially through the heads, the heads being formed with recessed portions into which said bolts project and by which the heads of the bolts are accommodated.

5. A roller mill including opposed heads, transversely extending bracket bars mountl ed upon the heads, arcuate circumferentially extending liner bars carried by the bracket bars, shims spacing the liner bars between each pair of bracket bars from each other, means for adjusting the heads towards or from each other, and means for holding the liner bars against the bracket bars.

In testimony whereof I hereunto aflix my signature.

EDWARD FITZ-GERALD LAW. 

